Question

我有一个js文件我打算用来控制应用中的2个视图模型。它为每个VM调用applyBindings一次。请注意console.log行：

(function () {
    'use strict';

    var currentFolder; // not used yet

    function initializeData(folder) {

        console.log('app.js initializing to ' + folder);

        // Get containers for binding view models
        var foldersContainer = document.getElementById('foldersPanel');
        var filesContainer = document.getElementById('filesPanel');        

        // Create view models
        var folderViewModel = new FolderViewModel(folder);
        var fileViewModel = new FileViewModel(folder);

        // Initialize list view models
        // folderViewModel.initialize();
        // fileViewModel.initialize();

        // Bind view model to view
        ko.applyBindings(folderViewModel, foldersContainer);
        ko.applyBindings(fileViewModel, filesContainer);
    }

    initializeData(rootFolder); // rootfolder = global set in cshtml to web.config appSetting
    })();

这是其中一个视图模型。另一个几乎完全相同。再次注意console.log行：

function Folder(name) {
    var self = this;
    self.Name = name;
}

function FolderViewModel(folder) {

    console.log('FolderViewModel.js received folder: ' + folder);
    var self = this;

    self.folders = ko.observableArray([]);
    self.currentFolder = ko.observable(folder);

    $.getJSON('/api/folders', function (data) {
        $.each(data, function (key, value) {
            self.folders.push(new Folder(value.Name));
        });
    });
}

function onFolderClicked(folder) {
    self.currentFolder(self.currentFolder() + '/' + folder.Name);
    console.log(self.currentFolder());
}

这是加载页面的控制台输出（一次）。什么可能导致第二次实例化视图模型，其中＆＃39;文件夹＆＃39;参数未定义？

app.js初始化为FileStorage
FolderViewModel.js收到文件夹：FileStorage
FolderViewModel.js收到文件夹：undefined

为什么淘汰视图模型被实例化两次？

0 个答案: